 During the day, most cuttlefish can be found buried below the substrate and fairly inactive.At night however, they are actively searching for prey and can ambush their prey from under the substrate.Cuttlefish are carnivorous and eat a variety of organisms including crustaceans (crabs and shrimp), small fish, molluscs (clams and snails), and sometimes other cuttlefish which is more commonly seen when the abundance of other prey is low.